class LeapYear:
    def __init__(self, year):
        self.year = year

    def answer(self):
        if self.year % 100 == 0:
            if self.year % 400 == 0:
                return "{0} is leap year".format(self.year)
            else:
                return "{0} isn't leap year".format(self.year)
        else:
            if self.year % 4 == 0:
                return "{0} is leap year".format(self.year)
            else:
                return "{0} isn't leap year".format(self.year)